A new speedo cable will probably correct the erratic needle problem.
I think your speedo should be marked 1280.
Larry Hoy; Denver, CO. USA
1969 MGB Roadster
1987 Jaguar XJ6 VDP
"It's not how fast you go, it's how fast you go fast"
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> -----Original Message-----
> From: owner-mgs@autox.team.net [mailto:owner-mgs@autox.team.net]On
> Behalf Of Rob Meredith
> Hi all,
>
> This has got me thinking. I've been having speedo problems with my 72B
> Roadster. As far as I can tell, there are 2 (I think...). First is that
> from time to time, the speedo is wildly eratic. This I believe is
> explained by a problem with the speedo cable (ie. worn, or poorly
> lubricated, or dirt or grit in the sheath...). Haven't had a chance to
> test this theory with a new cable yet, though.
>
> The second problem is that even when the speedo is not behaving
> erratically, it appears to be overstating the speed by about 10MPH (I
> think). At least when travelling in a 60Kph zone, the speedo reads about
> 50MPH (tacho states ~2200 RPM in fourth). Doing the MPH->KPH conversion,
> the speedo should read 38 when travelling at 60KPH.
>
> Given that my car is a non-overdrive vehicle (at least there is no
> overdrive in at the moment, there is no nor ever has been an overdrive
> badge and there is no record of overdrive removal in my receipts history),
> could the problem be caused by having an overdrive speedo
> attached to a non
> overdrive transmission?? Or am I barking up the wrong tree and
> should I be
> looking for a new speedo unit?
>
> Cheers all, and sorry for the wordy posting!
>
> Rob Meredith '72B
>
> ****************************************************
> ** Rob Meredith BComp(CompSc) BComp(InfoSys)(Hons)
> ** PhD Candidate
> ** School Of Information Management And Systems
> ** Monash University AUSTRALIA
> ****************************************************
>
>
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